Detection of floR gene and active efflux mechanism of Escherichia coli in Ningxia, China. (April 2018)

• Record Type: Journal Article
• Authors: Wang, Yi-Hui; Li, Xiao-Na; Chen, Cheng; Zhang, Jing; Wang, Gui-Qin
• Is Part Of: Microbial pathogenesis. Volume 117(2018)
• Page Start: 310
• Page End: 314
• Publication Date: 2018-04
• Subjects: Escherichia coli -- florfenicol resistance gene -- Minimal inhibitory concentration -- High performance liquid chromatography -- Efflux pump inhibitor; Pathogenic microorganisms -- Periodicals; Pathology, Molecular -- Periodicals; Communicable Diseases -- microbiology -- Periodicals; Communicable Diseases -- parasitology -- Periodicals; Micro-organismes pathogènes -- Périodiques; Pathologie moléculaire -- Périodiques; Electronic journals; 616.9041
• DOI: 10.1016/j.micpath.2018.02.042
• Languages: English
• ISSNs: 0882-4010

Abstract

Abstract: Florfenicol is an antibiotic, a fluorinated structural analogue of thiamphenicol and chloramphenicol, approved exclusively for use in Asia for aquaculture since the 1980's. Our study examined the prevalence of florfenicol resistance in bovine mastitis Escherichia coli isolates. A total of 245 E. coli isolates were collected from bovine mastitis in Ningxia Province, China between May 2016 to July 2017 and screened for florfenicol resistance gene, floR gene by PCR analysis. About 7.35% (15/245) of the isolates were positive for floR gene. Minimal inhibitory concentration (MIC) results showed that 9 isolates were susceptible strains and 6 isolates were highly resistant to florfenicol. HPLC (high performance liquid chromatography) results showed that the amounts of florfenicol was significantly improved in the presence of carbonyl cyanide 3-chlorophenylhydrazone (CCCP) as an efflux pump inhibitor. This, therefore, indicates that the employment of florfenicol in conjunction with CCCP in future drug formulations should be considered. Highlights: Minimal inhibitory concentration were examined the prevalence of florfenicol resistance in bovine mastitis Escherichia coli isolates, and used PCR analysis. The E.coli isolates from Ningxia are highly resistance to ampicillin, which are not suitable for clinical treatment. High performance liquid chromatography shows the result that resistant isolates may have the efflux pump of antibiotic drugs.